Three parcels weigh 3 kg, 5 kg and 10 kg. What is the mean weight of the three parcels?

Explanation

Adding the three weights gives 3 + 5 + 10 = 18 kg, and dividing that total by the 3 parcels gives a mean of 6 kg. The weight 5 kg is the middle one once the parcels are ordered, which answers a different question, because a mean compares the whole total against the number of parcels instead of picking a value out of the list.